#AKU SHAPER CRACK CRACKED#
In addition, the profile of the solute concentration in cracked mortar was determined based on the measured CT numbers. Image processing and analysis was carried out to visualize and quantify the diffusion behavior in 3D space. Cesium carbonate (Cs2CO3) was used as a tracer in the diffusion test because it has high X-ray absorption due to its high atomic number and thus contrasts with mortar and air voids in the CT images.
#AKU SHAPER CRACK CRACK#
Mortar specimens of varying shapes (prismatic and cylindrical), crack types (artificial and splitting tensile), and binder compositions (OPC and fly ash) were prepared. This paper explores the usage of microfocus X-ray computed tomography (CT) for visualization and quantification of diffusion phenomena in cracked concrete. Indications also suggest that the addition of fly ash would lead to the reduction of diffusivity through uncracked body of the mortar. Smaller crack opening would increase such restricted diffusion. The diffusive transport of solute in cracks thus can be restricted from microstructure's point of view. Results obtained from microtomographic images suggest that the entire crack space may not always be filled with the tracer. The measured diffusivity in the crack was controlled by both crack opening width and constrictivity. On the other hand, the constrictivity increased for the fly ash mortar having roughly the equivalent crack opening width. The geometric tortuosity of the crack was approximately 1.25 irrespective of the crack opening width and whether fly ash was added or not. Image analysis was also employed to measure the 3D crack geometry and tracer diffusivity from these CT images. Cesium Carbonate (Cs2CO3) was then used as a tracer in the in-situ diffusion test with the aid of X-ray CT.
Cracks in a cylindrical specimen of ordinary Portland cement (OPC) and fly ash mortar were induced using a splitting tensile test. This paper demonstrates the application of microfocus X-ray computed tomography (CT) to study solute transport in cracked concrete.
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